Harriet Compton-Milne can't remember a time when she wasn't worried. Just 21, the qualified jeweller feels old before her time. She can match stones and mend a watch - but she can't leave Bolton because her brother, Ben, an OCD-riddled genius, wouldn't be able to cope without her.

Her eccentric parents aren't much help: her boffin father is more interested in toy trains than his family, and her mother Lisa's face is so full of Botox that she can no longer express any emotion.

But when big trouble arrives, the family - including Hermione, Harriet's acerbic, attic-dwelling grandmother - will have to act as a unit for the very first time if they are to survive with any degree of sanity.

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